Become a roaming barkeep with the Big Screw Bottle Opener ($12). Machined from a solid bar of aluminum, this pocketable, keyring-friendly tool resembles a screw with a bottle opener on the end, but screw that piece off and it becomes a compact corkscrew. Small caveat: according to the description, you shouldn't take it to the airport, lest you get "screwed big by the TSA."